Carbureter.



P. P. GiLLES.

V CMRBURETERL y APPUCATION HLED Mmm, lsu. n

Patented June H, 12H8.

meenam Hmmm? 1N VEN TCR.

P. Pf GILLES.

CARBURETER.

APPLmATmN FILED MAY 21. i911.

Paented June ii, w18

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@wenn ze. enanas, or seamemenn, nieesacnnssees.

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'spammen of teneis naam. l Patented inne lli; lill/it.,

.To all @einem may concern.'

Be it `known that l, PIERRE P. Grimes, born in Switzerland of German parentage, now believing myself to be a citizen of the Swiss Confederation, and having formally declared my intention of becoming. a citizen of the United States of America in con.

formance with the United States immigration laws, and now residing at Springeld, in the county of Hampden and State of Massachusetts, United States of America, llave invented certain new and useful Improvements in Carbureters, of which the following' is a specification.

This invention relates to carburetoi's and more particularly to carbureters which may be used with and automatically" supplied with fuel from a low level supply tank.

An object of the invention is to provide a carburetor having an, air-tight fuel-supply chamber adapted :for direct connection to a low-level incl-supply tank, and one or more nozzles connected at one end to the chamber and the other end to the suction pipe of the czrbureter, the construction being characterized in'tliat the nozzles, in addition to their usual function, perform the additional function of vacuurnizing said chamber,y and constitute the sole means for performing the lastnamed function.

Another object of the invention is to provide in a carbureter of the class described two fuel passages from the air-tight chamber to the suction pipe, vone of which passages llas a regulable but substantially constant opening andl functions as a sloW- speed nozzle and the other of which has an opening which is variable proportionately with the 'throttle valve opening. The arrangement is characterized in that both nozzles function as the sole means for creatln a. vacuum 1n the air-tight chamber.

f ther obgecte and advantages will appear in ltlic :following description and will 'be parti larly pointed out in tlie appended claims.

The invention is sliown for illustrative purposes in tlie accompanying drawings7 in i Si' .l is a top plan view oi a carburetor einliodying the invention;

ig. 2 is a cross sectional view taken on line 2-2 oic Fig. l; Fig. 3 is an enlarged detail sectwnal C1 plan laken on the line 3--3 of Fig. 2;

elevation taken on Fig. 6 is a fragmentary, sectional view taken similarly to Fig'. 4c and illustrating a modification of the invention; and

Fig. 'i' is a cross sectional view taken similarly to Fig. 2, and illustratingpa further modication of the invention.

Referring to these drawings in detail and particularly to Figs. l to 5, inclusive, the carbureter casing comprises a substantially horizontal suction pipe l which is open at both ends and adaptedl for attach ment by the ianges shown to the intake manifold of the engine, and a tank ll which is preferably integral with pipe l() and is closed at the top'by a suitable cover lil. A fuel inlet pipe 13 (Fig. l), removably secured to cover l2 (Fig. this connected at one end through openings in the latter to the upper part of ll. 'Ellie other end of pipe l-i is adapted for connection. directl with a suitable fuel supply tank, not shown, such as a low level supply tenir.' in an automobile', for example.

Referring to Fig. V5, adjacent the air inlet end of pipe l() an air choke valve le is provided which is pivote mounted in pipe with its axis vertically "posed, and may be operated by a suitable lever l5 {llig l). Spaced from the choke valve leiis a throttle valve 16 secured by the screw 5 to a sleeve 17, which, as shown in Fig. 2, is vertically and rotatably mountedl in pipe 10. Fixed to the upper end of sleeve l? 'is a suitable lever 18 for turnin the sleeve and thus throttle 16. 'llireadct` into sleeve 17 `from lie upper end thereof is a needle valve 19 which may be raised andI lowered in the sleeve to open and close the upper 'end of an axial passage 20 leading to the lower end of the sleeve. The throttle l@ and sleeve l?V are formed with registering shown in Fig.

nasales afi relatively high degree 4b closing cherie valve The tenir ll ot the carmay be originally lilled by this 'n installed, or hy any other ile source of suction. The suotion apue 3G continued until fuel therein and the dow of fuel O furnishes a convenient inu n that the tank is completely r'llled early for operation.

normal operation, the needle valve Sal l to permit only a relatively small :tue-l to pass thereby. les com- :o valve the needle valve 19 zo a relatively large dow ot fuer thereby. Both the'main and slow speed nozzles are, however, regulable as desired may be adjusted by experimenta '1*' to secure lthe desired results. On startengine, the choke valve ll is preferl close-tl vvliil the throttle valve lo is honed. .he opening of the latter l and ilu-el is drawn through ope .ings 2l hy the suc or'erl to pipe l0. Since closed, relatively gine. .Lis a matter off tenu il is somewhat ,c Il, so that an inirougn the latter would be vlty action soon as valve This is desirable at starting. w by gravity cannot take place to 'aderale extent, however, as the de- ...Je in level is not great and,

i may be eliminated entirely as in lTio' *t3* u ri' trie startingA operation, the cliche vali opened and thereafter the throtlli only is manipulated which proportionate opening ol the fuel v valve for the main nozzle. has, a increase in is accompanied by ling increase in fuel. The sucis always effective through diately as it is uncovered iff ot throttle fl@ to draw non tanal'. i the fuel level has, however, dropped due to the gravity lovv. ed, the suction through passage 30 will Erst act to replenish the tank, but thereafter t will a tow ot fuel theref .c-portionate to the amount of sucp pe 0. 'lhis iow may made z hy regulation. ot sive roug i 'the main may be ed bv the needle valve lil to vary the ou of :fue to air. normal operhowever, the valve controls the diminishing selective opening 'svi ich the suction is available to act mes of relatively large sucti hen ti ottie i6 is nearly er 1.2 -T Y .Y

el. -f the opening the aile. le to draw a rich Y er throttle is opened to` permit a larger eticotive opening through which the suction may act on the tank atitimes of relatively low suction. The variations 'described are based, or" course, upon thei assumption that the engine speeds in botli instances are equal. At times when the throttle is wide open and the .degree of vacuum in pipe 10 is lower than usual, due to decreased engine speed, as when traveling on an upgrade; for example, if the engine is used in an automohile, a reserve supply is in edect obtained by the flow which may take place from tank l1 by gravity as'described. 0n slow speeds, the throttle 1li-may be closed suhc'iently to close valve 24 and yet leave the passage uncovered. When the parts are thus positioned, a relatively strong suction is obtained, which although el'ective only through a relatively small opening is nevertlieless suflicient to supply fuel in the desired quantity.

qWith the arrangement shown lin Fig. 7 the chamber 4t2 being relatively small may be rapidly lled by openingl the throttle 16 while choke valve i4 is entirely closed. Both nozzles may be utilized in the preliminary filling of the chamber, The operation of the carburetor shown in Fig. 7 is otherwise similar to that above described. With both forms, the fuel from the main nozzle may he gradually diminished on relatively slow engine speeds and may be entirelyI closed oil at very slow speeds, leaving the supply of fuel entirely to the slow speed nozzle, as it will be remembered that the passage 30 is not closed oil until throttle 16 is entirely closed while valve 24 is arranged to close before the throttle. The invention is characterized in that the for drawing fuel from the main fuel supply tank. -A gravity supply with the usual doet controlled valve is unnecessary as are also the vacuum fuel feeding devices which draw fuel by suction from a low level fuel supply tank and thereafter feed the fuel by gravity to a carburetor. Such fuel feeding devices involve oat controlled valves, as do also the carbureters which they supply, while in the present invention such valves are unnecessary and a supply of fuel from a low fuel supply tank may be veeetvely i obtained by comparatively simple means. The intermediate devices heretofore arranged between the nozzles and the main fuel supply tank may thus be eliminated. As against the former carburetor-s and fuel supply devices therefor, the present inven-v tion employs Substantially but a suction pipe 125 and nozzles and connections from the latter to the main fuel tank.

ilhe invention has been described in preferred form with detailed variations for the purposes ot illustration,y but the scope iso 

